function reportAjaxError(request){ alert('AJAX Error!'); } function getCaseStudy(id){ var placeIn = ($('tmp')); var url = '/inc/ajax.getCasestudy.php'; var myAjax = new Ajax.Updater( {success: placeIn}, url, { method: 'get', onFailure:reportAjaxError, parameters : {id:id}, evalScripts:true } ); }